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No, if it doesn't install even after unrooting you will have to SBF.
If you're okay with being rooted on 4.5.607: root again, install CWM, do a Nandroid backup, then SBF to 2.4.330, update to 4.5.607, root, install CWM, restore /data only via backup/restore, advanced restore. This will restore all your apps and settings in 4.5.607.